Mark Kozak, MD

• Associate Professor of Medicine
• Milton S. Hershey Medical Center
• Pennsylvania State University School of Medicine
• Hershey, Pennsylvania

Phyllodes Tumor: Invasion Phyllodes Tumor: Recurrence (Left) the stroma of phyllodes tumors is often highly cellular and often forms a fascicular pattern medications vs medicine purchase rumalaya amex. Extensive invasion into the surrounding breast tissue may be present and would not be seen in a fibroadenoma treatment 5th metacarpal fracture discount rumalaya american express. This tumor has recurred adjacent to the biopsy site changes from the prior excision treatment shingles cheap 60 pills rumalaya overnight delivery. This tumor invades into the adjacent adipose tissue and skeletal muscle and has also ulcerated the skin treatment molluscum contagiosum trusted 60 pills rumalaya. The characteristic clefts are formed as the stroma becomes more prominent and the spaces separating the epithelial surfaces widen medicine on time discount 60 pills rumalaya with visa. The resulting epithelial-lined clefts give rise to the characteristic leaf-like fronds that give the tumor its name. These tumors lack the characteristic phyllodes architecture and have been termed periductal stromal sarcoma. Cimino-Mathews A et al: A Subset of Malignant Phyllodes Tumors Express p63 and p40: A Diagnostic Pitfall in Breast Core Needle Biopsies. Yasir S et al: Significant histologic features differentiating cellular fibroadenoma from phyllodes tumor on core needle biopsy specimens. Lacroix-Triki M et al: -catenin/Wnt signalling pathway in fibromatosis, metaplastic carcinomas and phyllodes tumours of the breast. Lv S et al: Chromosomal aberrations and genetic relations in benign, borderline and malignant phyllodes tumors of the breast: a comparative genomic hybridization study. The numerous small cleft-like slits correspond to areas of stromal overgrowth lined by epithelium. The proliferating stromal cells stimulate the growth of nonneoplastic epithelial cells. This demonstrates the biologic crosstalk and close relationship between stromal and epithelial cells. The primary tumor was low grade but now is of intermediate grade and invades into adipose tissue. Progression to a higher grade occurs in ~ 1/3 of recurrences and is frequently associated with acquisition of additional genetic changes. Extensive sampling may be necessary to find diagnostic areas of benign epithelium. For lesions with increased stromal cellularity, atypia, or mitotic activity that cannot be categorized with certainty, a diagnosis of fibroepithelial lesion can be rendered and classification made after excision. These areas must be examined closely as nuclear pleomorphism, abundant vacuolated cytoplasm, and lipoblasts are diagnostic of liposarcoma. Phyllodes Tumor: Chondrosarcoma Phyllodes Tumor: Osteosarcoma (Left) Malignant heterologous differentiation can consist of liposarcoma, osteosarcoma, chondrosarcoma, or rhabdomyosarcoma. Extensive sampling to identify benign epithelial elements is often necessary for correct classification. Some lesions have overlapping histologic features and may be difficult to distinguish on the limited sampling on core needle biopsies. Extensive sampling of a spindle cell malignancy may reveal epithelioid areas, identifying this lesion as a carcinoma. Spindle Cell Carcinoma Spindle Cell Carcinoma: Angiomatoid Pattern (Left) Rare spindle cell carcinomas have an angiomatoid pattern and mimic angiosarcoma. A panel of antibodies is often necessary to distinguish these carcinomas from stromal malignancies. Immunohistochemical studies are often required to identify these lesions as carcinomas. Spindle Cell Carcinoma Spindle Cell Carcinoma (Left) Spindle cell carcinomas are almost always positive for keratin. About 1/3 show immunoreactivity for p63, possibly due to similarity to myoepithelial cells &/or squamous cells. Breast Rhabdomyosarcoma Metastatic Melanoma (Left) Primary sarcomas of the breast are extremely rare. This lesion has been bisected to show the white whorled surface of the mass, closely resembling a fibroadenoma, within an area of yellow adipose tissue. Some lesions have ill-defined borders due to the nature of the proliferation or because the lesion is present in an area of dense breast tissue. The radiologist must always confirm that the targeted lesion was adequately sampled. However, as shown here, angiosarcomas have red blood cells in the lumina of the vessels. Characteristic short intersecting bundles of uniform spindle cells are separated by broad bands of hyalinized collagen. The nuclei are round to oval with dispersed chromatin and may contain distinct small nucleoli. There is morphologic and molecular overlap between lipomatous myofibroblastoma and spindle cell lipoma. However, spindle-shaped cells, which would be unusual for invasive lobular carcinoma, are usually also present. Although the factors giving rise to these lesions are yet to be established, expression of sex steroid receptors suggests a hormonal etiology. Other stromal lesions, such as gynecomastia and leiomyoma, can also express these receptors. Solitary Fibrous Tumor Fibromatosis (Left) Solitary fibrous tumor consists of a haphazard arrangement of short spindle cells. Spindle Cell Carcinoma Sarcoma (Left) Rare breast cancers consist entirely or predominantly of spindle cells. Most show nuclear pleomorphism and mitoses and are easily recognized as malignant. There are no specific histologic features when only a portion of the tumor is available for evaluation, such as on a core needle biopsy. Biopsy is often not necessary because the imaging features are highly correlated with this diagnosis. Lipoma: Mammography Angiolipoma: Microscopic (Left) Angiolipomas consist of a mixture of small blood vessels and adipose tissue. Unlike radiolucent lipomas, angiolipomas form masses of intermediate density due to the vascular component. Carcinomas are almost always hypoechoic (not fat containing) and more vertical than horizontal. Lipoma Angiolipoma: Gross Appearance (Left) this angiolipoma is well circumscribed with pushing borders and has a distinct homogeneous, tan appearance as compared to the surrounding yellow adipose tissue. The vessels are limited to the circumscribed lesion and do not infiltrate into the surrounding breast tissue. Angiolipoma Angiolipoma: Fibrin Thrombi (Left) the majority of angiolipomas have small fibrin thrombi, which are an important diagnostic feature. Unlike dermal angiolipomas that may present with pain, breast lesions are usually asymptomatic. In contrast, lipomas consist of adipose tissue and do not have diagnostic features. However, a core needle biopsy is rarely performed for lipomas due to their distinctive radiologic appearance. This myoid hamartoma shows strong immunoreactivity in the stromal cells for desmin. Myofibroblastoma Myofibroblastoma: Desmin (Left) Myofibroblastomas and spindle cell lipomas are similar, if not identical, lesions. This myofibroblastoma has a prominent component of adipose tissue intermingled with areas of myofibroblasts. However, the intervening tissue consists of myofibroblasts as demonstrated by immunoreactivity for desmin. Angiosarcoma Liposarcoma (Left) Angiosarcomas grow as irregular anastomosing vascular channels with nuclear atypia and tufting of endothelial cells. These tumors typically form irregular masses, unlike the wellcircumscribed growth pattern of angiolipomas. Variation in the size of adipocytes, lipoblasts, atypia, and fibrous septa are helpful diagnostic features to recognize the lesion as a sarcoma. In this case, a clip from a prior core needle biopsy is present within this illdefined mass. Second, there are dense lymphocytic infiltrates that center around ducts, lobules, and blood vessels. Lymphocytic Mastopathy Lymphocytic Mastopathy: Gross Appearance (Left) the very dense interlobular stroma associated with lymphocytic mastopathy forms very hard white gross masses. A possible association with abnormal glucose deposition has been suggested for the abnormal stromal changes. Lymphocytic Mastopathy Lymphocytic Mastopathy (Left) In addition to the lymphocytic infiltrates associated with ducts and lobules, lymphocytic infiltrates also surround small blood vessels. Lymphocytic Mastopathy Lymphocytic Mastopathy: Epithelioid Stromal Cells (Left) the stromal cells of lymphocytic mastopathy can occasionally have enlarged nuclei and have a rounded shape. However, the cells can be shown to be of stromal origin using immunohistochemistry. If characteristic features are seen, such as in this case, and there is good radiologic correlation, excision is not necessary. However, a lymphocytic infiltrate is not present, and there is no association with autoimmune diseases. Inflammatory Pseudotumor IgG4-Related Sclerosing Mastopathy (Left) Inflammatory pseudotumors (also termed plasma cell granulomas) consist of a lymphoplasmacytic infiltrate involving fibroadipose tissue. Lymphocytes associated with some types of carcinomas are also predominantly T cells. It can be impossible to distinguish these tumors from invasive carcinomas by imaging and on gross examination. Granular Cell Tumor, Gross Appearance Granular Cell Tumor (Left) this granular cell tumor invades as small clusters and nests of tumor cells. The cells are very monomorphic in shape, size, cytoplasmic appearance, and nuclear features. Expression of proteins found in Schwann cells such as S100, as well as ultrastructural features, support this association. In this tumor, the cells infiltrate irregularly into the surrounding adipose tissue, giving the lesion an irregular border by imaging. Single cells and small clusters of cells are dispersed in fibrous stroma and adipose tissue. Occasionally, the collagenous stroma can be quite prominent and tumor cells may be sparse. Granular Cell Tumor, Epithelioid Appearance Granular Cell Tumor, Spindle Cell Appearance (Left) the cells of granular cell tumor most commonly have an epithelioid rounded appearance and are present in cohesive nests. The cytoplasm is distinctive, as it is abundant and contains eosinophilic granules corresponding to the numerous lysosomes. The nuclei are typically monomorphic in appearance, small and round with inconspicuous nucleoli. Granular Cell Tumor, Core Needle Biopsy Granular Cell Tumor, S100 (Left) this core needle biopsy shows a granular cell tumor consisting of cells with abundant foamy eosinophilic cytoplasm infiltrating in a collagenous stroma. The expression of calretinin, a primarily neuronal protein, adds further support for neuronal differentiation or derivation for these lesions. Immunohistochemical studies for broad-spectrum cytokeratins confirm that tumor cells are negative, whereas adjacent benign epithelial cells are positive. Granular Cell Tumor, -Catenin Apocrine Carcinoma (Left) Apocrine carcinomas have abundant eosinophilic cytoplasm, as seen here. The marked nuclear pleomorphism and the presence of mitotic figures would not be seen in a typical granular cell tumor. Cells may resemble granular cells, but cytoplasm is vacuolated, not finely granular. Secretory Carcinoma Secretory Carcinoma, S100 (Left) Secretory carcinomas have abundant amphophilic cytoplasm, similar to granular cell tumor. However, the tumor cells also form tubules containing secretory material; this would not be seen in granular cell tumor. However, immunoreactivity for cytokeratins will be present in carcinomas and absent within granular cell tumor. Metastatic Melanoma Alveolar Soft Part Sarcoma (Left) Metastatic melanoma can form solid masses of epithelioid cells with foamy cytoplasm. However, the sarcomas have crystalline deposits, while granular cell tumors show diffuse positivity. The margins are generally well defined, although focal infiltration into surrounding tissue can be seen. These cells should not be mistaken for epithelioid cells in a spindle cell carcinoma. This type of cell is more common in proliferative fasciitis and proliferative myositis. This pattern is in contrast to fibromatosis in which the lymphocytic infiltrate is at the periphery. In the late stages, the tumor can be very paucicellular with a collagenized stroma. Patients can be spared surgery, as the lesion will eventually spontaneously regress.

Meperidine (Demerol) is associated with decreased fetal heart rate variability but not hypotension medications rights rumalaya 60 pills on line. Cesarean may be required if the fetal heart rate tracing does not improve medications quizlet buy rumalaya with american express, but typically epidural-induced hypotension will respond to therapy symptoms 1dp5dt cheap rumalaya 60 pills without a prescription. The best therapy for umbilical cord prolapse is elevation of the presenting part and emergency cesarean delivery medicine in the 1800s order generic rumalaya. The risk of cord prolapse with a vertex presentation or frank breech presentation is very low; the risk with a footling breech or transverse lie is substantially higher medications on backorder rumalaya 60 pills purchase amex. The most common finding with uterine rupture is a fetal heart rate abnormality such as deep variable decelerations or bradycardia. Her prenatal course has been uncomplicated except for asymptomatic bacteriuria caused by Escherichia coli in the first trimester treated with oral cephalexin. After the placenta is delivered, there is appreciable vaginal bleeding estimated at 1000 cc. After the placenta is delivered, there is appreciable vaginal bleeding, estimated at 1000 cc. Know the treatment for uterine atony and the contraindications for the various agents. This meets the definition of postpartum hemorrhage for a vaginal delivery, which is a loss of 500 mL or more. The most common etiology is uterine atony, in which the myometrium has not contracted to cut off the uterine spiral arteries that are supplying the placental bed. If these are ineffective, then prostaglandin F2-alpha or rectal misoprostol is the next agent to be used in this patient. Because she is hypertensive, methylergonovine maleate (Methergine) is contraindicated. It should be noted that if the uterus is palpated and found to be firm and yet bleeding continues, a laceration to the genital tract should be suspected. H er risk factors for uterine atony include preeclampsia since she is likely to be treated with magnesium sulfate. Practically speaking, it means significant bleeding that may result in hemodynamic instability if unabated. Also, a decline in hematocrit levels of 10% has been used to define postpartum hemorrhage, but it is not a satisfactory definition because determinations of hemoglobin or hematocrit concentrations may not reflect the current hematologic status. Because of the large proportion of cardiac output that perfuses the uterus and placental bed, a postpartum woman can exsanguinate in 10 to 15 minutes without intervention. Uterotonic agents include intramuscular methylergonovine (Methergine), intramuscular prostaglandin F2-alpha, and rectal misoprostol. Ergot alkaloids should not be given in women with hypertensive disease because of the risk of stroke. Prostaglandin F2-alpha should not be administered in those with asthma due to the potential for bronchoconstriction. If medical therapy is ineffective, two large-bore intravenous lines should be placed, the blood bank should be notified, and anesthesiologist alerted. Intrauterine tamponade such as with a balloon can be performed while preparing for surgical therapy. Surgical therapy may include exploratory laparotomy with interruption of the blood vessels to the uterus such as uterine artery ligation or internal iliac artery ligation. More recently, suture methods that attempt to compress the uterus, such as the B-lynch stitch, have been described. Uterine inversion (see Case 3), whether partial or complete, must also be considered. If the uterus is firm and there are no lacerations, one must also consider coagulopathy. Classically, the patient will not have bleeding until about 2 weeks after delivery and is not significantly anemic. O ral ergot alkaloid and careful follow-up is the standard treatment; other options include intravenous dilute oxytocin or intramuscular prostaglandin F2-alpha compounds. Other causes of secondary postpartum hemorrhage include uterine atony (perhaps secondary to retained products of conception) and infection. If suspecting retained products of conception, suction dilation and curettage can be performed. Endometritis is suspected with uterine fundal tenderness, fever, and foul-smelling lochia. This includes oxytocin given immediately upon delivery of the infant, late cord clamping, and gentle cord traction with uterine countertraction with a well-contracted uterus. Although retained placenta is a theoretical risk with early oxytocin administration, studies have not found this complication. After being at 6-cm dilation for 3 hours despite adequate uterine contractions as judged by 240 Montevideo units, she underwent a cesarean delivery. Upon delivery of the placenta, profuse bleeding was noted from the uterus, reaching 1500 mL. The obstetrician noted significant blood loss from the vagina, totaling approximately 700 mL. W hich of the following is the most common etiology for the bleeding in this patient Utero-ovarian ligament ligation H ypogastric artery ligation Supracervical hysterectomy Ligation of the external iliac artery Cervical cerclage 6. With a prolonged labor, such as with arrest of active phase, a patient is at risk for uterine atony. Certainly, lacerations or injury to uterine vessels are potential issues and should be visible on examination. If these measures are unsuccessful, surgical management of uterine atony includes ligation of blood supply to the uterus to decrease the pulse pressure (suture ligation of the ascending branch of the uterine artery or the utero-ovarian ligament or internal iliac artery) or placement of compression stitches (B-lynch stitch) that try to compress the uterus with external suture "netting. This is most likely arising from a cervical laceration, commonly laterally into or adjacent to the arterial supply of the cervix. If the fundus is firm and the uterus well contracted, the next step should be to assess for a genital tract laceration. Inspection for whether the bleeding is coming supracervical (uterus) versus cervical or lower in the genital tract is critical. Often, if the patient is in a regular labor and delivery room, moving the patient to the operating room with adequate lighting and anesthesia can be helpful. At times, a genital tract laceration may extend high into the vaginal fornix; careful assessment of the full extent of the laceration and judicious surgical repair is warranted. Ligation of utero-ovarian ligaments can be performed in addition to ligation of uterine arteries, which can diminish further blood flow to the uterus. A cervical cerclage is not a treatment option for hemorrhage; instead, it is a procedure performed in order to prevent preterm labor and delivery in a pregnant woman with cervical insufficiency. Bleeding from multiple venipuncture sites together with abruption suggests a coagulopathy. This is a systemic response, so no type of localized treatment (such as hypogastric artery ligation or utero-ovarian ligament ligation) will fix the problem. A patient with disseminated intravascular coagulation can present with a simultaneously occurring thrombotic and bleeding problems, which makes it difficult to choose a treatment option. The most common cause of late postpartum hemorrhage is subinvolution of the uterus, in which the placental implantation site does not decrease in size as expected; thus, when the eschar overlying the placental site falls off (7­ 10 days after delivery), there is more bleeding than expected. The most common cause of late postpartum hemorrhage (after the first 24 hours) is subinvolution of the uterus. Hypertensive disease is a contraindication for ergot alkaloids, and asthma is a contraindication for prostaglandin F2-alpha. Next diagnostic step: Basic obstetric ultrasound examination to assess for dates and multiple gestations. Understand that the most common causes of abnormal serum screening are wrong dates and multiple gestations. Know that an elevated maternal serum -fetoprotein level may be associated with an open neural tube defect. Be aware of the large number of noninvasive and invasive tests for fetal anomalies and aneuploidy. The gestational age window of 16 to 20 weeks is the appropriate time to screen with serum testing. Although the triple screen may be offered to women over the age of 35 years, or advanced maternal age, genetic amniocentesis provides more diagnostic information. It passes into the maternal circulation by diffusion through the chorioamniotic membranes. By combining these serum chemicals into a multiple marker screening test, approximately 60% of all Down syndrome pregnancies can be identified. Different variations of the multiple marker test exist, such as one that adds inhibin A as a fourth analyte to further improve detection rates. Furthermore, first-trimester screening may be combined with second-trimester screening to improve the detection rate of Down syndrome to 90%. The first step in the management of an abnormal triple screen is a basic ultrasound to determine the correct gestational age, to identify the possibility of multiple gestation, and to exclude fetal demise. If the risk of trisomy or neural tube defects is still increased after a basic sonogram, amniocentesis or targeted ultrasound is offered. A targeted examination can correctly identify fetuses with neural tube defects by direct visualization of the fetal head and spine. Furthermore, ultrasound may also detect those fetuses suspicious for having Down syndrome by identification of a thickened nuchal fold, shortened femur length, or echogenic bowel. Fetal karyotype is also obtained through amniocentesis, which will identify fetal aneuploidy, such as the trisomies. The identification of a fetus affected by a neural tube defect or a chromosomal abnormality can be an ethical and moral dilemma for the parents, whose previous hopes and dreams for having a "normal" child are now extinguished. The parents should not be forced into any decision, but should be provided information in an unbiased fashion. Initial studies indicate a 97% sensitivity and near 99% specificity rate for Down syndrome, but the study populations were small. This technology has not been well studied in large populations yet; and its role at the time of printing was delegated to those women at high risk for Down syndrome. Specific exposures to agents during organogenesis- days 15 to 60-may lead to malformations. During the first 2 weeks of gestation, a teratogen usually has an "all or nothing" effect. There is a consensus, however, that some agents should never be used during pregnancy (retinoic acid derivatives). The fetal abdomen reveals a cystic mass in the right abdominal region and a cystic mass in the left abdominal area. W hich of the following is the best explanation of the genetics of this condition Explain to the patient that it is too late for serum screening, but that her risk for Down syndrome is not much higher than her age-related risk. She underwent a targeted ultrasound examination which did not reveal a neural tube defect. Gestational diabetes is associated with hydramnios occasionally; however, duodenal atresia is not related. Rh isoimmunization can also lead to hydramnios and hydrops but not duodenal atresia. The genetics for cleft palate and cleft lip in the absence of other anomalies is multifactorial, and not a clear genetic transmission. Other disorders that are multifactorial include cardiac malformations and neural tube defects. The window for serum screening is usually between 15 and 21 weeks, so that her gestational age of 25 weeks is too late. The history of her sister having a baby with Down syndrome confers a very small, if any, increased risk for her own pregnancy. If the patient herself had a prior baby with Down syndrome, the risk would be substantially increased, and genetic counseling with possible amniocentesis for karyotype would be appropriate. Thus, many practitioners will perform serial ultrasound examinations, monitor for these complications, and perform fetal antenatal testing such as biophysical profile testing. Genetic counseling is appropriate with a family history of possible heritable syndromes. A glucose challenge test would not be helpful in evaluating heritable syndromes because it is used as a screen for gestational diabetes. Genetic counseling is recommended before a risky procedure, such as an amniocentesis, is performed because based on the family history, it may not be indicated in this situation. Lithium is associated with Epstein anomaly (a fetal heart malformation); Dilantin is associated with a fetal hydantoin syndrome of intrauterine growth retardation, microcephaly, and facial defects. The next step in the evaluation of abnormal triple screening is the basic ultrasound. Noninvasive prenatal diagnosis of Down syndrome: current knowledge and novel insights. She has a known twin pregnancy, and throughout the pregnancy, she had significant nausea and vomiting, but otherwise her prenatal course has been unremarkable. Serial ultrasound examinations have been performed showing concordant growth of the twins. Ultrasound examination reveals a twin pregnancy with a dividing membrane, and adequate amniotic fluid. Artificial rupture of membranes is undertaken to allow for a fetal scalp electrode of twin A.

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Hematopoietic Elements and Fat Mature Adipose Tissue (Left) the mature adipose tissue component often predominates in myelolipoma medicine 0552 rumalaya 60 pills with amex, and no atypical adipocytic/stromal nuclei or lipoblasts are present medications grapefruit interacts with generic 60 pills rumalaya with mastercard. Note peripheral adrenal cortical tissue treatment 7th feb bournemouth buy rumalaya 60 pills without a prescription, mature bone medications for bipolar purchase rumalaya 60 pills visa, and fatty hematopoietic lesional tissue sewage treatment generic rumalaya 60 pills with mastercard. This classic case shows a mixture of granular eosinophilic cells, multivacuolated cells, and scattered univacuolated mature adipocytes. Multivacuolated Cells Lipoma-Like Hibernoma (Left) Occasional cases of hibernoma show predominantly univacuolated white fat cells with only scattered multivacuolated and eosinophilic granular cells. Vassos N et al: Deep-seated huge hibernoma of soft tissue: a rare differential diagnosis of atypical lipomatous tumor/well differentiated liposarcoma. At low magnification, it is characterized by a prominent lobularity imparted by extensive fibrous septation. Rarely, the fibrous tissue may predominate over the fat component, suggesting a fibroblastic process. Fibrous Septa Immature Fat (Left) the presence of immature fat is definitional for lipoblastoma and is characterized by lipoblasts in various stages of development. The more primitive foci often show myxoid stroma and are most common at the periphery of the lobules. Note the presence of conspicuous bland, spindled preadipocytes, also reminiscent of myxoid liposarcoma. Delicate Capillary Vasculature Maturing Fat (Left) In most cases of lipoblastoma, the adipocytes near the center of a lobule are more mature than those at the periphery. Note, however, the marked variation in size; a feature not generally seen in conventional lipoma. Cellular Foci Cellular Foci (Left) Cellular foci in lipoblastoma are characterized by a proliferation of very bland, uniform spindled cells. The very young age of the patient is often a major clue to avoiding a misdiagnosis of myxoid liposarcoma in these cases. Hibernoma-Like Cells 76 Lipoblastoma Tumors of Adipose Tissue Myxoid Stroma Stromal Mucin Pools (Left) Rarely, lipoblastoma may show extensive myxoid stromal change within which lobules showing more conventional morphology appear to float. In general, however, this feature is more commonly identified in myxoid liposarcoma than lipoblastoma. Stromal Mucin Pools Diffuse Lipoblastoma (Left) Stromal mucin pools and microcystic-like change were prominent in this case of lipoblastoma from the retroperitoneum of a 7-monthold infant. Maturing Lipoblastoma Maturing Lipoblastoma (Left) Fat maturation has been well documented in recurrent cases of lipoblastoma, as evidence by the presence of mostly mature adipose tissue with minimal to no primitive fat or myxoid component. The nuclei are characteristically enlarged, irregular, and hyperchromatic, and sometimes show a "smudgy" quality. The enlargement and hyperchromasia distinguish them from benign nuclei with vacuolated Lochkern change. Note the true atypical stromal cell within the adjacent fibrous band, which helps support the diagnosis. These cases also frequently contain a component of heterologous smooth muscle (so-called lipoleiomyosarcoma). These cells often show dense eosinophilic cytoplasm and clustering/overlapping of numerous small rounded nuclei. They are identified by multiple intracytoplasmic fat vacuoles that compress and indent/scallop the hyperchromatic adipocyte nuclei. Note the marked hypocellularity that, along with the essentially absent mitotic activity, distinguishes this morphology from true dedifferentiation. Lipoblasts, particularly univacuolated and bivacuolated forms, are generally common. Lipogenic and nonlipogenic (dedifferentiated) components are often readily distinguished from one another by differences in color and consistency. Sampling of peripheral fatty tissue to detect a minor lipogenic component is important. This transition may appear abrupt, as shown, with a sharp demarcation between the 2 components. Gronchi A et al: Myogenic differentiation and histologic grading are major prognostic determinants in retroperitoneal liposarcoma. Out of context, this morphology is indistinguishable from that of an undifferentiated pleomorphic sarcoma. This morphology may lead to consideration of other diagnoses, including leiomyosarcoma and malignant peripheral nerve sheath tumor. In conjunction with a fascicular morphology, this finding may suggest inflammatory myofibroblastic tumor. Rhabdomyoblasts are one of many types of elements and may be highlighted with desmin and myogenin immunostains. In the retroperitoneum, myogenic differentiation (particularly rhabdomyoblastic) has been associated with decreased survival. Although not shown in this image, an increase in cellularity may be present at the periphery of these lobules. Lobular Growth Abundant Myxoid Stroma (Left) Myxoid liposarcoma is characterized in most cases by an abundant myxoid stroma, particularly in low-grade areas; however, this stroma becomes less conspicuous in hypercellular, higher grade areas. Note that, unlike prognostically significant hypercellular or round cell areas, the nuclei in these transitional areas do not show marked crowding or overlapping. Hypercellular areas show dense crowding of cells and nuclei with limited or no myxoid stroma. Note that the the arborizing capillary vasculature is still present and identifiable but much less conspicuous. Along with scattered lipoblasts, this finding can be a helpful clue to the diagnosis in diffusely hypercellular or round cell tumors. The number of pleomorphic lipoblasts vary considerably in number and distribution from case to case. Pleomorphic Liposarcoma Pleomorphic Lipoblasts (Left) Pleomorphic lipoblasts are similar to conventional multivacuolated lipoblasts except that the nuclei are much larger, hyperchromatic, and pleomorphic than what is typically seen in lower grade liposarcomas. Silicone Granuloma · Morphologic appearance may mimic sheets of lipoblasts · History of silicone injection or implants present · No atypical mitoses or coagulative necrosis 15. Metastatic Malignant Melanoma · No evidence of lipoblastic differentiation · S100 protein (+) in tumor cells · Expression of melanocytic markers 25. A more conventional pleomorphic morphology was seen in most other fields in the depicted case. These tumors show diffuse, variably cohesive sheets and lobules of rounded cells, simulating an epithelial neoplasm. This confusion is most likely in retroperitoneal tumors, given the regional anatomy. In general, immunohistochemistry is best utilized to excluded other entities (carcinoma, myogenic sarcomas, etc. Although usually small (< 2-3 cm), most cases show rapid growth, raising clinical concerns for malignancy. Nodular Fasciitis Myxoid Stroma (Left) A loose, myxoid stroma is common in nodular fasciitis, particularly in lesions that are excised early. Tumor cells are characteristically arranged loosely in a haphazard fashion, reminiscent of "tissue culture" growth. Fibroma of Tendon Sheath · Occurs predominantly in acral locations (particularly finger) · Cellular tumors can show overlap with nodular fasciitis · Peripheral slit-like vessels common 106 Nodular Fasciitis Fibroblastic/Myofibroblastic Lesions Cytologic Features Stromal Dyscohesion (Left) Mitotic figures are very common in nodular fasciitis and naturally align with the frequent rapid growth seen clinically. In some cases, mitoses are so numerous that a sarcoma is considered (or misdiagnosed). Extravasated Blood Cells Osteoclast-Like Giant Cells (Left) Extravasated erythrocytes and chronic inflammatory cells (particularly lymphocytes) are relatively common in nodular fasciitis. Scattered plasma cells may also be seen in some tumors; however, they are generally inconspicuous. Stromal Collagen Occasional Storiform Growth (Left) As nodular fasciitis progresses, the amount of myxoid stroma often decreases and stromal collagen increases. The lesional cells, in turn, start to appear less haphazard and somewhat more organized. Cellularity is variable in these cases, and myxoid zones may or may not be present. Keloidal Collagen Increased Cellularity (Left) Foci or zones of increased cellularity and organization are not uncommon in nodular fasciitis and can easily lead to consideration (or misdiagnosis) of sarcoma. Mitotic figures are usually frequent as well, further increasing the risk of overdiagnosis. Cellular Areas Cellular Areas (Left) Limited architectural organization is not infrequently seen in cellular nodular fasciitis; however, well-developed long fascicles are very uncommon and should lead to consideration of more locally aggressive entities, such as low-grade myofibroblastic sarcoma or leiomyosarcoma. Cellular Areas 108 Nodular Fasciitis Fibroblastic/Myofibroblastic Lesions Cellular Areas Origin in Muscle (Left) Areas of increased stromal collagen and architectural organization in nodular fasciitis, as shown in this image, may lead to consideration of fibromatosis or a low-grade myofibroblastic sarcoma. Care must be taken to not misidentify entrapped atrophic skeletal muscle fibers as pleomorphic, hyperchromatic tumor cells. Intravascular Fasciitis Intravascular Fasciitis (Left) Nodular fasciitis may grow partially or entirely within a vessel and is recognized by the term intravascular fasciitis. Despite the occlusive growth, this does not usually result in any functional impairment, and the lesion presents as a mass clinically. Veins or arteries can be involved, and the lesional tissue sometimes extends through the vessel wall. Proliferative Fasciitis Ganglion-Like Cells (Left) the hallmark of proliferative fasciitis/myositis is the presence of enlarged epithelioid or polygonal cells with basophilic or amphophilic cytoplasm and large, eccentric vesicular nuclei with prominent macronucleoli. A correct diagnosis can usually be derived from the clinical presentation and immunohistochemistry. Pediatric Proliferative Fasciitis Pediatric Proliferative Fasciitis (Left) Pediatric proliferative fasciitis is more likely to show increased mitotic activity than the typical adult form. If more than a rare atypical figure is identified, malignancy should be carefully excluded. Pediatric Proliferative Fasciitis Stromal Hyalinization (Left) Occasionally, older lesions may show stromal hyalinization. Together with the large, ganglion-like cells, this feature may mimic osteoid deposition and lead to misdiagnosis as osteosarcoma. Characteristically, the proliferation splays out muscle fibers, imparting a highly infiltrative appearance. Proliferative Myositis 112 Proliferative Fasciitis/Myositis Fibroblastic/Myofibroblastic Lesions Proliferative Myositis "Checkerboard" Pattern (Left) Just as in proliferative fasciitis, proliferative myositis characteristically contains scattered ganglion-like cells with prominent nucleoli. Spindled Morphology Rare Metaplastic Bone (Left) In some areas of proliferative myositis, the lesional fibroblasts may adopt a subtle fascicular morphology, reminiscent of fibromatosis. Cellular Foci Fasciitis/Myositis Mimics (Left) Similar to proliferative fasciitis, the ganglion-like cells in proliferative myositis may show areas of increased cellular density. However, there is often a prominent component of adipose tissue in reactive adhesions, and the clinical presentation is often very different from that of proliferative fasciitis. Vascularized Rim Reactive Myofibroblasts (Left) the reactive myofibroblasts of ischemic fasciitis are often enlarged and contain basophilic to amphophilic cytoplasm. Nucleoli may be inconspicuous or prominent, the latter sometimes resembling ganglion cells. Liegl B et al: Ischemic fasciitis: analysis of 44 cases indicating an inconsistent association with immobility or debilitation. Lesions tend to show gradual progression from loose or cellular fibroblastic zones to areas containing immature woven bone formation to more peripheral areas of remodeling and mature lamellar bone formation. The cellularity of these areas varies widely from loose and sparse to strikingly dense. Klapsinou E et al: Cytologic findings and potential pitfalls in proliferative myositis and myositis ossificans diagnosed by fine needle aspiration cytology: report of four cases and review of the literature. In this example, eosinophilic osteoid undergoes progressive mineralization and transformation into trabeculae of woven bone. In this example, fibrocartilage merges with woven bone, which subsequently merges with a collagenous spindle cell area, creating a distinctive zonal architecture. In some cases, these peripheral lobules may separate completely and appear as entirely separate nodules. Well-Circumscribed Nodule Multilobular Architecture (Left) Fibroma of tendon sheath varies from 0. Despite the circumscription, marginal or incomplete excision may lead to local recurrence in some cases. Note the relatively smooth outer border of the lesion and the lower cellularity at the center of the nodules. Other degenerative changes, such as metaplastic bone or cartilage, may be seen on occasion. Desmoplastic Fibroblastoma Spindled and Stellate Fibroblasts (Left) High magnification shows stroma that is densely collagenous and contains spindle and stellate fibroblasts in patternless distributions. Although cells may be plump, no true atypia is seen, and mitotic figures are rare or absent. Nagaraja V et al: Desmoplastic fibroblastoma presenting as a parotid tumour: a case report and review of the literature. Dystrophic Elastic Fibers Elastic Fiber Special Stain (Left) Verhoeff van Gieson histochemical stain nicely highlights the abnormal elastic fibers in elastofibroma as dark, fragmented cords and spherules. Giannotti S et al: Elastofibroma dorsi: case series of a rare benign tumour of the back. It is often well circumscribed, and > 1/2 of cases display a fibrous capsule of varying thickness. Note the sharp circumscription of the tumor, which is a feature of most, but not all, cases. Rare degenerative nuclear changes may be seen, but significant nuclear atypia is not seen. Importantly, the lesional cells remain uniform and cytologically bland, and foci of more conventional morphology are often present.

The vessel is expanded and lumen is occluded by fibrin with entrapped erythrocytes symptoms when pregnant rumalaya 60 pills order mastercard. Focal apoptotic debris is seen treatment hyperthyroidism cheapest rumalaya, but inflammatory infiltrate is characteristically absent medications look up buy rumalaya 60 pills fast delivery. Endothelial Swelling and Endothelialitis Fibrin in Arteriole (Left) Prominent endothelial swelling and inflammation are seen in an interlobular artery symptoms 9dpiui buy discount rumalaya line. Lupus Nephritis With Arterial Thrombi Arterial Intimal Edema and Fibrin in Lupus (Left) An interlobular artery shows severe intimal edema with a narrowed lumen and fibrin medicine versed order 60 pills rumalaya fast delivery. Hofer J et al: Complement factor H-antibody-associated hemolytic uremic syndrome: pathogenesis, clinical presentation, and treatment. Thrombotic Microangiopathy, Autoimmune Vascular Diseases Mesangiolysis and Arterial Occlusive Edema Arteriolar Fibrinoid Necrosis and Thrombosis (Left) the capillary tuft is mildly retracted, and mesangiolysis is seen. Electron Microscopy · Glomeruli Endothelial swelling and subendothelial expansion by lucent material ­ Loss of endothelial fenestrations Platelets and fibrin in capillary lumens No electron-dense deposits Podocyte foot processes generally well preserved ­ Effacement in sunitinib toxicity associated with severe proteinuria 9. Fibrinoid Necrosis in Arterioles Ischemic Collapse of Glomerular Capillaries (Left) Cross sections of arterioles show endothelial swelling with entrapped erythrocytes and apoptotic debris. Glomerular endothelial cells show loss of fenestrations, detachment, vacuolization, and subendothelial lucency. Kourouklaris A et al: Postpartum thrombotic microangiopathy revealed as atypical hemolytic uremic syndrome successfully treated with eculizumab: a case report. A 38-year-old woman with postpartum visual loss, shortness of breath, and renal failure. This biopsy is from a young woman who was 1 week postpartum and had persistently elevated levels of serum creatinine. Fibrin thrombi identified in several arterioles likely precipitated cortical necrosis. Platelet Aggregation in Glomerulus Glomerular Basement Membrane Duplication (Left) An aggregate of platelets is seen in the glomerular capillary lumen. Duplication of the glomerular basement membrane is observed with an entrapped platelet. An adjacent arteriole with thrombotic microangiopathy has an onion skin appearance. An interlobular artery is completely occluded by intimal edema and proliferation, resembling endarteritis in allografts. The interlobular arteries demonstrate intimal edema with luminal fibrin thrombi, while the adjacent glomerulus shows mild ischemic collapse. Cellular Intimal Proliferation Artery With Edema and Red Cells in Intima (Left) this artery has increased cellularity in the intima and occlusion of the lumen. IgM and C3 sometimes are also present in affected glomeruli and arteries, thought to be nonspecific. The podocytes demonstrate foot process effacement, and electron-dense deposits are observed. The endothelial cells show reactive changes, including loss of fenestrations and increased cytoplasmic organelles. Glomerular Ischemia and Tubular Atrophy Recanalization of Artery (Left) Extensive glomerular ischemic retraction and tubular atrophy are seen in this kidney biopsy. Luminal cellular occlusion and intimal concentric lamination are seen within an interlobular artery. The glomerular capillary lumina are obscured, which results in a substantial decrease in glomerular filtration. This intimal alteration of the artery can also be observed in scleroderma and malignant hypertension. There is also frequent duplication of the glomerular basement membranes, which is a manifestation of chronic endothelial cell injury. Electron microscopy of a peritubular capillary demonstrates several layers of new basement membrane. The endothelium appears "activated" with increased cytoplasm, organelles and loss of fenestrations. Focal duplication of the glomerular basement membranes is noted in some capillaries. Dedeken L et al: Haematopoietic stem cell transplantation for severe sickle cell disease in childhood: a single centre experience of 50 patients. A rough rule of thumb for hypertrophy is whether the glomerulus is > 50% of a 40x field. The endothelium shows loss of fenestrations, a sign of injury in this 38-year-old woman with a recent sickle cell crisis trace proteinuria and a Cr 3. There is substantial interstitial fibrosis and tubular atrophy surrounding the scarred glomerulus. Segmental Sclerosis Collapsing Glomerulopathy (Left) Jones methenamine silver demonstrates collapsing glomerulopathy, which can rarely occur in sickle cell disease patients. Peritubular Capillary Thrombus 558 Sickle Cell Nephropathy Vascular Diseases Polymerized Hemoglobin Polymerized Hemoglobin (Left) Electron microscopy at high magnification shows a sickle-shaped red blood cell in a glomerular capillary with cytoplasmic rod-like inclusions, which represents polymerized hemoglobin. Hemosiderosis Hemosiderin Granules (Left) Prussian blue stain reveals widespread blue granules in proximal tubular epithelial cells. Papillary Scarring Papillary Scarring (Left) Gross photograph shows congestion of the vasa recta in the renal medulla with marked scarring of the renal papilla in a sickle cell disease patient with papillary necrosis. Marcantoni C et al: A perspective on arterionephrosclerosis: from pathology to potential pathogenesis. Castleman B et al: the relation of vascular disease to the hypertensive state; the adequacy of the renal biopsy as determined from a study of 500 patients. Secondary features are interstitial fibrosis, tubular atrophy, and global glomerulosclerosis. Juxtaglomerular Apparatus Hyperplasia Juxtaglomerular Apparatus Hyperplasia (Left) Jones methenamine silver shows hyperplasia of the juxtaglomerular apparatus with renin granules; this feature can sometimes be found in hypertensive renovascular disease. Renal Artery Stenosis 564 Hypertensive Renovascular Disease Vascular Diseases Intimal Fibroplasia Arteriosclerosis (Left) Intimal fibroplasia is present in an interlobar-sized artery, and this change can often be found in hypertensive renovascular disease. Arteriosclerosis Arteriosclerosis (Left) Trichrome stain shows an interlobar-sized artery with arterial intimal thickening and medial smooth muscle layer thinning in hypertensive renovascular disease. There is a migration of fuchsinophilic medial muscle cells into the intima, a process called intimal fibroplasia. Medial Hypertrophy Fibroelastosis (Left) In a case of hypertensive renovascular disease, a trichrome stain shows thickening of the arterial media. Glomerular C3 566 Hypertensive Renovascular Disease Vascular Diseases Myointimal Thickening Hyperplastic Arteriolosclerosis ("Onion Skinning") (Left) Higher power image of this renal vessel shows the "onion skin" change in a vessel wall due to concentric myointimal thickening. Fragmented Red Cells in Capillary Arterial Matrix Accumulation (Left) Electron micrograph shows a capillary with fragmented red blood cells (schistocytes) in a severe case of hypertensive renovascular disease. The endothelium is severely injured and shows ballooning of the cytoplasm and apoptotic nuclei. Seddon M et al: Atherosclerotic renal artery stenosis: review of pathophysiology, clinical trial evidence, and management strategies. Aggarwal A et al: Prevalence and severity of atherosclerosis in renal artery in Northwest Indian population: an autopsy study. Selye H et al: Pathogenesis of the cardiovascular and renal changes which usually accompany malignant hypertension. The production of persistent elevation of systolic blood pressure by means of renal ischemia. When hypertension damages the kidney before the stenosis, a granular surface due to subcapsular scars is evident. Tortuous, Stenotic Renal Artery Glomerulosclerosis and Thyroidization of Tubules (Left) There are numerous sclerotic, closely approximated glomeruli and tubular atrophy in a thyroidization pattern in this kidney affected by renal artery stenosis. Angiography (right) shows that the shrunken kidney essentially has no blood supply. The tortuous renal arteries effectively terminate where the kidney is expected to appear, compared with the contralateral kidney. Arteriogram of Fibromuscular Dysplasia Perimedial Fibroplasia (Left) Low-power view of the renal artery with perimedial fibroplasia shows that the outer media is occupied by a layer of blue-staining fibrous tissue, as highlighted on this trichrome stain. Some smooth muscle cells are spindled, and others simulate an epithelioid morphology. Aneurysm-Type Formation in Fibromuscular Dysplasia Elastic Fiber Heterogeneity in AneurysmType Change (Left) An elastic stain of the renal artery involved by fibromuscular dysplasia shows pale-staining fibrous tissue filling the outer media with the inner media being filled by a darker layer, which alternates between thick and thin, focally simulating aneurysm formation. Loose Cellular Fibrous Tissue Loose Cellular Fibrous Tissue Simulating Endarteritis (Left) High-power H&E of perimedial fibroplasia with "secondary" intimal fibroplasia shows loose, cellular fibrous tissue expanding the media and extending into the intima, leading to renal artery stenosis. Due to the admixed variety of cells, some of which resemble lymphocytes, this may simulate "endarteritis" seen in other contexts. Dense Fibrous Tissue in Fibromuscular Dysplasia Haphazard Infiltration of Dense Fibrous Tissue (Left) Higher power trichrome stain of perimedial fibroplasia of the renal artery shows that the arterial wall smooth muscle is haphazardly infiltrated by dense fibrous tissue, which occupies the majority of the vascular wall. Spindled and Epithelioid Cells in Perimedial Fibroplasia 578 Fibromuscular Dysplasia Vascular Diseases Spindling in Perimedial Fibroplasia Chondroid-Type Change in Fibromuscular Dysplasia (Left) Higher power trichrome stain of perimedial fibroplasia of the renal artery shows dense fibrous tissue between smooth muscle cells, which have acquired a spindled morphology. The smooth muscle cells in this case acquire a clear cell appearance that superficially resembles cartilage. Disoriented Muscle in Fibromuscular Dysplasia Luminal Protrusion by Media (Left) the medial fibroplasia form shows disoriented medial smooth muscle that protrudes into the lumen of the renal artery highlighted with this trichrome stain. Bilateral Fibromuscular Dysplasia on Aortogram Fibromuscular Dysplasia Patterns (Left) Abdominal aortogram shows bilateral involvement of the renal arteries with fibromuscular dysplasia with the classic "string of beads" appearance. This interlobar artery shows occlusive intimal fibromuscular dysplasia with secondary aneurysm formation, and luminal thrombosis and organization. Arterial Aneurysm Cellular Fibrointimal Thickening (Left) this interlobular artery has a thin, focally muscledeficient media. The internal elastic lamina is intact and the media is well populated by smooth muscle cells. Srinivasan A et al: Spectrum of renal findings in pediatric fibromuscular dysplasia and neurofibromatosis type 1. There is disruption of the media with a vigorous proliferation of spindled cells associated with organization. Cellular Fibrointimal Proliferation Arcuate Artery Aneurysm (Left) this arcuate artery aneurysm is contained by the elastic lamina whereas the aneurysm lumen is largely filled by loose, edematous paucicellular tissue. The arcuate arterial intima is fibrotic and shows marked elastosis and luminal compromise. The lumen of the aneurysm and the artery are filled with loose edematous tissue, hemorrhage and scattered spindle cells. Arcuate Artery Aneurysm Intimal Thickening With Palisading Cells (Left) this arcuate artery has loose paucicellular intimal tissue with small clusters of palisading spindle cells that suggested neural derivation in early reports. In two regions, the medial smooth muscle layer is completely absent with only a single interrupted layer of elastica remains. Dense Intimal Fibrosis 582 Neurofibromatosis Vascular Diseases Cellular Fibrointimal Thickening Paucicellular Fibrointimal Thickening (Left) this peripheral interlobular artery shows loose but cellular, intimal thickening with marked luminal compromise. Renal Sclerosing Peritubular Nodule Renal Sclerosing Peritubular Nodule (Left) Renal sclerosing peritubular nodules are very rare and have only been described as case reports in neurofibromatosis 2. They are mainly cortical lesions but also occur in the outer stripe of the outer medulla. It does, however, stain prominently despite its largely connective tissue composition. Venular Thrombus Thrombus (Left) Hematoxylin & eosin demonstrates a thrombus within a portion of the lumen of a renal venule in a patient with nephrotic syndrome due to minimal change disease. Acute Thrombus Arterial Intimal Changes (Left) Hematoxylin & eosin demonstrates prominent leukocyte infiltration of the intima and loose intimal thickening in a segment of a renal artery downstream from a renal artery thrombus. Large Atheroembolus Chronic Atheroembolus (Left) Periodic acid-Schiff shows a remote atheroembolus with cholesterol clefts embedded within prominent intimal fibrosis. Recanalization of the atheroembolus with slit-like lumina lined by endothelial cells is also present. The clinical significance of this lesion is unclear as no other atheroemboli were identified in this biopsy. Airy M et al: Tubulointerstitial nephritis and cancer chemotherapy: update on a neglected clinical entity. The granular material stained for myoglobin by immunohistochemistry, but looks identical to hemoglobin or bile casts. Cast 592 Overview and Classification of Tubulointerstitial Diseases Tubulointerstitial Diseases Etiologic Classification of Tubulointerstitial Diseases (With Selected Examples) Genetic Ciliopathies. This case in a 78-year-old man with acute renal failure was due to a recent exposure to antibiotics. Polyoma can also be readily detected by immunohistochemistry, using an antibody to the large T antigen. This patient had been taking a number of herbal preparations for many months, after which she was found to have an elevated serum creatinine. The fibrosis is indicative of a chronic component of the interstitial nephritis (trichome stain). Acute and Chronic Interstitial Nephritis Acute Pyelonephritis (Left) Acute interstitial inflammation with mononuclear cells and neutrophils is seen in a case of acute pyelonephritis. This biopsy is from a renal transplant patient who had laboratory evidence of a urinary tract infection. Occasional neutrophil casts can be seen for no apparent reason in endstage kidneys. Tubular basement membrane immune complex deposits (inset, immunofluorescence staining for IgG) aid in the diagnosis of an autoimmune interstitial nephritis. This case shows extensive involvement by nonnecrotizing granulomatous inflammation.

Tefferi A et al: Polycythemia vera and essential thrombocythemia: 2015 update on diagnosis medicine pills cheap rumalaya 60 pills line, riskstratification and management symptoms 9 weeks pregnancy cheap rumalaya online. The eosinophils may or may not (as in this image) exhibit atypical cytologic features medicine app cheap 60 pills rumalaya mastercard. Gotlib J: World Health Organization-defined eosinophilic disorders: 2014 update on diagnosis medicine 5658 discount rumalaya 60 pills fast delivery, risk stratification treatment centers for depression purchase rumalaya overnight delivery, and management. The mast cells contain spindle-shaped nuclei and are associated with scattered eosinophils. Aberrant coexpression of this antigen supports the neoplastic nature of this mast cell proliferation. Mast cell infiltrate can be easily overlooked when abundant eosinophils are present. In addition, a paratrabecular aggregate of spindled mast cells is seen with abundant pale cytoplasm. Advanced stage disease is associated with additional cytogenetic and molecular abnormalities. This table presents only individual genes with a combined average of 5% of in these 2 studies. Although the erythroid lineage is slightly increased, the woman has moderate normochromic normocytic anemia. The erythroid and myeloid lineages show complete maturation, and sinuses are patent. Dysplastic features include irregular and abnormal nuclear segmentation and cytoplasmic hypogranulation. Some cases of refractory anemia with excess blasts may not have prominent dysplastic features. Common dysplastic features include nuclear budding, binucleation, and other nuclear irregularities. In this case of refractory anemia, note the normal morphology in the megakaryocytes and granulocytes. Note the loss of 1 copy of both the centromeric and 7q31 region probes in 2 of the 3 cells. Note the sieve-like lacy chromatin pattern in the nuclei of the erythroid precursors. Patients with anemia of chronic disease or myelodysplastic syndromes may have increased storage iron. The bluestained granules surrounding erythroid nuclei represent mitochondrial iron deposition. Ring sideroblasts are defined as nucleated red blood cells with 5 or more iron granules encircling 1/3 or more of the nucleus. Dysplasia is limited to the erythroid lineage, as evidenced here with megaloblastoid changes, binucleation, karyorrhexis, and asynchronous nuclear to cytoplasmic maturation. Many megakaryocytes are small and hyperchromatic (micromegakaryocytes), although some are larger with separate nuclei. In this case of a patient with complex karyotype, only trisomy 8 and del(20q) are detected. Trisomy 8 is indicated by 3 green signals, and del(20q) by the loss of 1 orange signal. Fernandez-Mercado M et al: Targeted re-sequencing analysis of 25 genes commonly mutated in myeloid disorders in del(5q) myelodysplastic syndromes. While some cases may show dyserythropoiesis, granulocytic dysplasia or increased blasts (5%) are absent. Each nucleus shows a single orange signal instead of 2 normal signals, consistent with loss of 5q. The megakaryocytes also have essentially normal morphology without significant dysplastic features. Trephine biopsy sections are markedly hypocellular (~ 5% cellularity) and show severe trilineage hypoplasia. The distinction between promonocytes and atypical monocytes can be very difficult. Megakaryocytes may be dysplastic (small and monolobated as in this case) or have a myeloproliferative type of morphology (Right) A reticulin stain of a bone marrow core biopsy shows significant fibrosis. Detection of a clonal cytogenetic or molecular abnormality (as illustrated here by trisomy 8) will exclude a reactive process. Conventional cytogenetics shows monosomy 7, supporting a diagnosis of juvenile myelomonocytic leukemia. Hahm C et al: Genomic aberrations of myeloproliferative and myelodysplastic/myeloproliferative neoplasms in chronic phase and during disease progression. It assigns lineage as well as establishing an antigen phenotype that can be followed subsequently for residual disease testing. A complex karyotype is variably defined (usually 3 abnormalities) and is associated with an unfavorable genetic risk classification. Many of the granulocytes have an abnormal appearance characterized by abnormal nuclear segmentation or cytoplasmic granulation. Also present is a hypergranular neutrophilic precursor with so-called salmon-colored granules. Also typical are the abnormally clumped together cytoplasmic, salmoncolored granules. Note the near complete effacement of marrow architecture, although a rare megakaryocyte and erythroid islands can be seen. The monocytes are immature in appearance with more dispersed chromatin and delicate nuclear clefts. The monocytic cells exhibit less mature chromatin, nucleoli, and less nuclear folding than would be seen in a mature monocyte. The immature monocytes (promonocytes) exhibit more dispersed chromatin, minimal nuclear grooves, and occasional nucleoli. The somewhat heterogeneous appearance of the myeloid elements is attributable to a combination of a myeloblast and a monocytic component. Note the associated findings of bone marrow failure (anemia and thrombocytopenia). Cytoplasmic azurophilic granules and cells with slightly more mature monocytic features. Some of the cells exhibit round nuclei while others bear a typical folded nuclear appearance. They also show more folded nuclei than is often appreciated on the aspirate smears. The monocytes may exhibit abnormal cytologic features, raising concern for a myeloid malignancy. The characteristic abnormal eosinophils are a helpful clue to the correct diagnosis. The normal banding pattern of chromosome 3 is illustrated in the unaffected copy on the left. Xiao N et al: Ott1 (Rbm15) regulates thrombopoietin response in hematopoietic stem cells through alternative splicing of c-Mpl. In this case, morphology ranges to smaller from large blasts with abundant cytoplasm lymphoblast-like blasts. The bone marrow is nearly 100% cellular, with replacement of normal hematopoietic elements by a monotonous infiltrate of myeloblasts with round to irregular nuclei and variable amounts of cytoplasm. Bhatnagar B et al: the use of molecular genetics to refine prognosis in acute myeloid leukemia. These are classified as blast equivalents and have immature chromatin with delicate nuclear folding. They were historically called chloromas due to the green color on gross examination. They may or may not retain features of the erythroid lineage and can be very difficult to diagnose even with immunophenotyping. The monocytes and blast equivalents are highlighted in blue and purple, respectively. Cytospin preparations may alter the morphology, often making nuclear contours appear more irregular and also enhancing the prominence of the nucleoli. Dysplastic myeloma megakaryocytes are a typical feature of therapy-related myeloid neoplasms. Li Z et al: Next generation sequencing reveals clinically actionable molecular markers in myeloid sarcoma. Circulating blasts are present in the peripheral blood of a 4-week-old boy with Down syndrome, consistent with transient abnormal myelopoiesis. The karyotype showed multiple abnormalities in addition to the constitutional trisomy 21, including acquired trisomies of chromosomes 8, 14, and 19. Julia F et al: Blastic plasmacytoid dendritic cell neoplasms: clinico-immunohistochemical correlations in a series of 91 patients. Diffuse large B-cell lymphoma is a heterogeneous group of mature B-cell lymphomas. Cases with recurrent cytogenetic abnormalities usually have typical lymphoblast morphology as well. The lymphoblasts are monotonous, with intermediate size, scant cytoplasm, and immature chromatin. Safavi S et al: Novel gene targets detected by genomic profiling in a consecutive series of 126 adults with acute lymphoblastic leukemia. Note the residual myeloid precursors in the background with lymphoblasts at the center. TdThis not lineage specific and is typically expressed in lymphoblasts of both B and T lineages. Messina M et al: Genetic lesions associated with chronic lymphocytic leukemia chemo-refractoriness. Immunohistochemistry for cyclin-D1 in mantle cell lymphoma shows positive nuclear staining. Here, the 2 signals, red, and green, remain separate, and there are no yellow fused signals. The "stars" are tingible body macrophages that appear pale in a "sky" of darker tumor cells. This karyotype depicts the t(14;18)(q32;q21), which is detected in 80-90% of follicular lymphoma cases. Epub ahead of print, 2014 Okosun J et al: Integrated genomic analysis identifies recurrent mutations and evolution patterns driving the initiation and progression of follicular lymphoma. Roulland S et al: t(14;18) Translocation: A predictive blood biomarker for follicular lymphoma. The follicles are composed of many centroblasts, but centrocytes are also present. Threshold, negative control, high positive control, and low positive amplification are highlighted in a patient sample with follicular lymphoma. Epub ahead of print, 2014 Braggio E et al: Genomic abnormalities of Waldenstr m macroglobulinemia and related low-grade B-cell lymphomas. Kappa and lambda stains demonstrate kappa restriction and are further proof that this is a clonal proliferation. Most of the lymphocytes are small, round to slightly irregular, and hyperchromatic. Noted at the center, small lymphocytes are surrounded by marginal zone lymphocytes with pale cytoplasm. This is supportive evidence that this diffuse infiltrate represents a B-cell lymphoma. The neoplastic cells contain oval nuclei with mature chromatin and abundant pale cytoplasm with distinct cytoplasmic borders. In a subset of cases with hypocellular marrow, the hairy cells can easily be overlooked on morphologic assessment without evaluation of an immunohistochemical stain for a B-cell marker. Epub ahead of print, 2014 Robak T: Hairy-cell leukemia variant: recent view on diagnosis, biology and treatment. There is a Howell-Jolly body in a red blood cell, indicating functional asplenia. The red pulp is diffusely infiltrated with neoplastic cells and the white pulp architecture is absent. The lymphocytes are characteristic of chronic lymphocytic leukemia/small lymphocytic lymphoma. There are lighter areas within a background of small lymphocytes, which correspond to proliferation centers. Within the proliferation centers, the larger cells are paraimmunoblasts and the smaller cells with central nucleoli are prolymphocytes. Diffuse large B-cell lymphoma shows plasmacytoid features with abundant eosinophilic cytoplasm. This diffuse large B-cell lymphoma shows large pleomorphic cells, some appearing Hodgkinlike. There is a range of cell size in the neoplastic cells, with intermediately sized cells as well as large-sized cells. Characteristically, there is skin or organ involvement with sparing of the lymph nodes. This type of "other" large B-cell lymphoma is often localized to the mediastinum, and when disseminated, spares the lymph nodes.

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References

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